Malicious PDF — malware analysis report

Static analysis result for SHA-256 25830f7a4189c23d…

MALICIOUS

PDF

84.2 KB Created: 2021-06-30 09:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfa6c68ba9483d29d2ce722a4b9d852c SHA-1: a798b85668981a67371189ef4e0fde26447bc26c SHA-256: 25830f7a4189c23dd11e4dc3ccf63ba4f1d8d68ddbbb1df13c7827c33713262f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature indicated by the heuristics and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/351c4400ca7777ae9626107d3c16f590/42896800247.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4ef5fa5166cce5785198e65f8bd43083/80868836202.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/7636d0ee74ea30f047660d4ec8d5995d/sitadorovofaxokofa.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a7b5b778e91ea285d1f8585dbb21362f/13596163123.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/63ea42f0b87974b15583f39db8eeb7c7/pekadulesoguzasile.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3042e1b372---tegebazorupimemepibasigem.pdf
    • http://aklond.com/UploadFilesfile///2021042908491834.pdf
    • https://foundryindia.org/userfiles/file/85096880333.pdf
    • http://allycatering.com/userfiles/92173080129.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9rk257ipbp6cqoulrabv9brtip/vorizivexaxiporamo.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a908d2ddc9---tegudujaguvekuxuxusibo.pdf
    • http://flomojapan.com/upload/files/56354504796.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/046249215a3819b042e927339d2a90ef/79514230580.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0d8cba34fefa7b07b3b13c07da510f8a/piponatubun.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/800073b4effa86f9f537811371137856/58072266276.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f939ba6831---nejojumapomuzam.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4135758407---36668500455.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50f181b7f---kagut.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9e54eda5da64622b2df6b92d231e25c8/62626447417.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bda5043a04c---24739245154.pdf
    • http://dental-forum.ru/userfiles/file/18912419523.pdf
    • http://staropolski.net/Upload/file/16218757917.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/94565932261.pdf
    • http://tuzvedo.hu/elemek/file/wakifamot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=feeling+of+having+to+clear+throat+constantly
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e750.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16792 bytes
font_01_sfnt_off0000ff62.bin
f94b5d3b186a58c08685f0f041dee2085d407c00fe292347e8cc01f910615d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 16568 bytes
font_02_sfnt_off00012a76.bin
3c70d1304f836b1062a35c1cf569387ba6bc682389e365656982296fef8c95c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 10772 bytes

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